- California Martial Arts Academy - Children's and adults' programs. Locations in Irvine, Mission Viejo, and Rancho Santa Margarita.
- Nishiki Koi Club - Includes members' ponds, information on keeping koi, and meeting details.
- OC Rhythm - Youth basketball training. Mission, calendar, and fee schedule.
- Orange American Youth Soccer Organization: AYSO Region 1335 - Serving the City of Orange, Villa Park, Orange Park Acres, East Anaheim, and Anaheim Hills.
- Orange County Golf - A list and interactive map of the golf courses in Orange County.
- Pateadores Soccer Club - Fields boys and girls teams from U9 to U19; hosts the Pats Cup, a Class 1 tournament. Includes player, team and field information.
- PlayOCgolf - Information about Orange County golf courses.
- The Irvine Ranch Wildlands and Parks - Offers parks, trails and wilderness for recreational activities.
- The Legacy Project - Documents the transformation of the shuttered El Toro Marine Corps Air Station into a metropolitan park, the Orange County Great Park, by oral history, photographs and video.
- The OC Dog - Quarterly print and online magazine with articles of interest to dog owners. Information on dog parks, shelters, and rescues.
- Trail Safety Patrol: Friends of the Santa Ana River Trail - Volunteer community group involved in trail safety education, eco-friendly preservation and recreational multi-use of the Santa Ana River Trail system. E-mail to report incidents.
